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Solder Wire S321

The S321 solder wire is a highly active solder wire and a proven product for work in the metal, sheet metal and electrical industries. S321 contains urea as flux core and is additionally halogen activated. Due to its high activity, the flux shows good wetting properties on almost all metal surfaces (except aluminium).
Solder Wire S321

Product Advantages

  • very high activation
  • suitable for most metal surfaces
  • residues must be removed
  • residues are easily soluble in water
  • not suitable for stainless steel and aluminium


The solder wire S321 can be used for hand and robot soldering as well as flame soldering. The minor flux residues should be removed after the soldering process.


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